Unless it was going to be my “forever” fun I wouldn’t do it. I suppose it might be able to be “aged” but ...
Finding an old gun with engraving is another story. I think it is a nice tie to the history of the fun. Below is a photo of the shield on one of my Hussey’s. I believe is is the Gilmore family crest. The motto translates to “It shall be given to those who persevere.”